chore: fix namespace for server-init

[kohlisid]

Fixes #4

Add namespace env for server-secret-init container if installed in a non default namespace

test                 numaflow-controller-6f764f7958-zs48s         1/1     Running   0              3m1s
test                 numaflow-dex-server-c785467c7-hf6z9          1/1     Running   0              3m1s
test                 numaflow-server-97f67d6f4-xqmbr              1/1     Running   0              3m1s
test                 numaflow-webhook-74477447cc-bwzdk            1/1     Running   0              3m1s

[kohlisid]

@whynowy I just realized no one is added as auto reviews for this repo! And I'm not able to add people as well. Could you please review this I've moved it to draft for now